High frequency type antenna within conductive apertured wall



g- 1958 A. .J. WARBECK 2,843,717

HIGH FREQUENCY TYPE ANTENNA WITHIN CONDUCTIVE APERTURED WALL Filed Aug. 27, 1954 IN V EN TOR. AN THGWY u. WAEBECA A TTORNE I United States Patent 2,848,717 HIGH FREQUENCY TYPE ANTENNA WiTI-HN CONDUCTIVE APERTURED WALL Anthony J. Warbeck, Manchester, Conn.

Application August 27, 1954, Serial No. 452,618 Claims. (Cl. 343 794 This invention appertains to improvements in high frequency antennas and particularly relates to an improved television receiving antenna.

It is the principal object of the instant invention to dispense with the need for employing directors or reflectors and to provide a simple and light Weight antenna which can be easily installed on a mast, directly on the side of a house, in an attic or the like place and which does not require that it be installed in a dangerously high and unsightly manner above a house, such as conventional antennas require.

A further object of this invention is to provide an antenna which avoids any mismatch between antenna and lead in wires by employing only a lead in line.

Another object of this invention is to provide an antenna of the two-leg type wherein each leg of the same is arranged within a coaxially disposed and radially spaced tubullar radiating element, each element being formed with a patterned series of radial openings, such openings permitting the signal to penetrate the legs of the antenna.

The foregoing and ancillary objects are attained by this invention, the best known form of which is described in the following and illustrated in the attached drawing, wherein:

Figure 1 is a front elevational view, partly in section of a high frequency antenna installed and constructed in accordance with this invention;

Figure 2 is a vertical sectional view taken on line 2-2 of Figure 1;

Figure 3 is an end elevational view thereof; and

Figure 4 is a detailed sectional view taken on line 4-4 of Figure 1.

Referring now more particularly to the drawing, the numeral designates a suitable support, Which is shown for purposes of explanation as a rod like mast.

Attached to the support 10 in parallel vertically spaced relation are tubular radiating elements or shells 12 and 14, which are formed from conductive material, preferably aluminum. The shells are formed with circumferentially spaced rows of axially disposed and spaced, radial openings 16 and are provided at their centers with circumposed insulator 18. U-bolts 20 are disposed on the insulators and have their threaded free ends attached to the support 10.

Conductive rods 22 and 24, preferably formed of aluminum and each constituting a leg of the two-leg antenna, are coaxially arranged within the shells 12 and 14. The rods have straight portions 26 and 28 which are arranged within the shells. Insulator plugs 30 close oi the ends of the shells and are formed with axial, antrally disposed apertures 32 to receive the opposing ends of the straight portions. The diameter of the apertures 32 is just sufiicient to receive the rods. Each straight portion of the rods has a free straight end 34 which extends axially beyond the adjacent ends of the shells and outwardly of the plugs.

The rod 22 has a bent end 36 at the end 38 of the straight portion, the end 36 being bent downwardly and inwardly and terminating in a distal end 40 (see Fig. 4) which parallels the straight portion of the rod and lies alongside and above the end 42 of the shell 14. A split clamp 44 is attached around the end 42 of the shell 14 and has its apertured ends attached by a bolt 46 to the 2,848,717. l-"atentecl Aug. '19, 1958 distal end 40. The rod 24 has a bent end 48 at the end 50 of the straight portion and such bent end 48 is bent upwardly and inwardly and has a straight terminal end 52 similar to the end 40 which parallels the straight portion and is attached by a split clamp 54 to the end 56 of the shell 12.

The bent end 48 of the rod 24 is provided with a terminal post 58 to which a single lead in line 60 is attached.

The rod 22 forms a leg of the two-leg antenna and the shell 12 is coaxially disposed on the straight portion thereof in radially spaced relation thereto. The openings in the shell permit the signal to penetrate to the straight portion 26 of the rod 22, which acts as a filter and also makes the antenna low loss. The end portion 36 of the rod acts as a detector. The rod 22 receives from channels 2 to 6.

The rod 24 forms the other leg of the two-leg antenna and its shell 14 functions identical to the shell 12. The rod and shell receive channels 7 to 13.

In actual practice, it has been found that an extremely eflicient antenna can be made and installed in accordance with the principles of this invention, which will weight only one pound. Such an antenna was formed from aluminum tubing and aluminum rods. The rods were diameter, 4 in length with 2 /2 extending out from the tubing, which was 1% in diameter, then bent at 2 /2" joining the opposite tubing. The terminal post was disposed 3 away from the tubing. The antenna was vertically installed with the shells disposed horizontally in parallelism and spaced vertically 7" apart.

Such dimensions are, of course, merely by way of limitations, since the principle remains the same regardless of size and dimensions. Thus, while the preferred form of the invention has been illustrated and described, other forms may be realized as come Within the scope of the invention, defined in the attached ciaims.

I claim:

1. A high frequency antenna comprising a pair of legs,

the legs being disposed in vertically spaced parallel relation, radiating shells coaxially disposed on the legs, insulation means interposed between the legs and the shells, said shells each having a series of openings formed radially therein, means connecting each of the legs to an opposite shell and a terminal post for a single lead in line on one of said connecting means.

2. An antenna as claimed in claim 1, wherein said openings are formed in circumferentially spaced rows and the openings in each row are axially spaced along the shells.

3. An antenna as claimed in claim 1, wherein said shells are open ended and said insulation means includes insulator plugs disposed in the ends of the shells and having central, axially disposed apertures to receive the extending ends of the legs.

4. An antenna as claimed in claim 1, wherein said legs constitute rods having straight portions disposed within the shells and having ends projecting beyond the ends of the shells, one of said ends being free and the other of said ends carrying the connecting means.

5. An antenna as claimed in claim 4, wherein said connecting means includes integral bends on the said endsof the rods, said bends having straight terminal ends which parallel the straight portions, and wherein clamps are attached to said terminal ends and circumposcd on the shells.

References Cited in the file of this patent UNITED STATES PATENTS 720,568 De Forest Feb. 17, 1903 2,115,761 Blumlein May 3, 1938 2,158,376 Moser et a1 May 16, 1939 

